DE102020107254A1 - System for temperature regulation of cables - Google Patents

Abstract

In particular, a system for regulating the temperature of a cable laid at least partially in the water and on land is disclosed, the system comprising: means for collecting water on the land side, so that water can be collected in these means and can be discharged from these means; Means for controlling an amount of water such that an amount of water flowing out of the means for collecting water on the shore side or flowing into them from the body of water is controllable; and means for cooling a cable which enclose the cable at least in a section of the means for collecting water on the shore right into a body of water, with a cavity being formed between the cable and the means for cooling the cable through which the water flows to cool the cable. Furthermore, a use of an objective system is disclosed.

Description

area

The invention relates to a system for regulating the temperature of cables, in particular for offshore wind energy plants and / or offshore wind parks.

background

Offshore wind energy plants and / or offshore wind farms are usually connected or tied to the mainland via one or more cables, so-called export cables. One of the most critical points on the route from an offshore wind turbine and / or an offshore wind farm to the transfer station (e.g. transformer station or transformer) on land is the transition from a body of water (e.g. sea) to land the cables are subjected to high thermal loads here. Often this very short area (about several 100 m in length) is the thermal and current-carrying capacity bottleneck for an export cable, which can be several 10 km long in total. In order to better dissipate the heat from the export cable, a type of concrete mix is often used to encase the cable. However, this harbors many uncertainties, e.g. B. whether the cable is really completely sheathed. In addition, it is difficult or impossible for the concrete manufacturer or the cable manufacturer to take technical responsibility for this design, e.g. B. in the event of an error.

General description of some exemplary embodiments

It would be desirable to be able to provide a solution in order to be able to minimize or avoid the aforementioned problems, and in particular to be able to improve the high thermal load at the transition from a body of water to the land of such cables.

Against the background of the state of the art presented, the objective object is to at least partially reduce or avoid the problems described, that is to say in particular to provide a possibility to be able to improve the high thermal load at the transition from a body of water to the land of such cables .

This object is objectively achieved by a system according to a first aspect with the features of claim 1. The object at issue is further achieved by a use according to a second aspect, the use claiming a system according to the first aspect for connecting at least one offshore wind energy installation.

• Mittels des Kabels ist insbesondere ein Offshore-Bauwerk angebunden. Ein Offshore-Bauwerk ist beispielsweise eine Offshore (z. B. im Meer) installierte Windenergieanlage, und/oder ein Offshore installierter Windpark. Ein derartiger Windpark umfasst beispielsweise mehrere Windenergieanlagen.

In the following some exemplary embodiments are described in more detail according to all aspects:

• In particular, an offshore structure is connected by means of the cable. An offshore structure is, for example, a wind energy installation installed offshore (e.g. in the sea) and / or an offshore wind farm. Such a wind park comprises, for example, several wind energy plants.

In particular, the cable is a so-called export cable. By means of such a cable or export cable, for example, the energy generated by a wind energy installation or a wind park installed offshore is conducted to the transfer station (e.g. substation). Such a cable includes, for example, an aluminum core. Such a cable can be several km long, e.g. B. 50, 100, 150 km, or more. Such a cable is designed, for example, for a maximum transmission power of 75% of the total power of the wind energy installation or wind farm connected to the cable. This also makes it possible, for example, to use reserves or, in the case of technical defects, reserves in one or more other such cables. The cable is, in particular, a high-voltage direct current transmission cable (HVDC cable) for the transport of electrical energy generated by an energy generation system (e.g. wind energy system) to a consumer.

The present subject is based on the knowledge that in order to interpret a so-called landfall, i.e. the transition of a cable from a body of water (e.g. the sea, a river, or a lake) to the land, water of the body of water specifically from the body of water can be guided past the cable for temperature regulation, collected and optionally returned in a controlled manner. In this way, the system according to the first aspect can consequently be used to regulate the temperature of a cable laid at least partially from a body of water (e.g. the sea) to the land. The cable is, for example, a standard submarine cable, which is constructed in such a way that the cable can be in permanent contact with water on its outer sheath without its function being impaired.

A body of water is specifically understood to mean flowing or standing water that is integrated into the natural water cycle. A body of water is, for example, the sea, a stream, a river, a stream, a lake, or a reservoir, to name just a few non-limiting examples.

The system includes means for collecting water on land, so that water is in them Funds are collected and can be spent from these funds. This is, for example, a water collection or catch basin that is located on the land or on the land side. To regulate the temperature of the cable, in particular to cool it, water or seawater flows past the outer surface, for example a sheathing of the cable. On the one hand, the water flows from the body of water into the means for collecting water on the land side, e.g. B. in a corresponding water collection basin. On the other hand, the water (e.g. sea water) in the means (e.g. water collection basin) for collecting water on the land side can (back) the cable e.g. B. flow cooling into the water.

The system further comprises means for controlling an amount of water so that an amount of water flowing out of or into the means for collecting water on the shore side is controllable. For example, the means for controlling a quantity of water is a quantity regulation of that water that flows or flows from the body of water into the means for collecting water on the land side, and optionally back from the means for collecting water on the land side into the body of water.

The system further comprises means for cooling a cable, which enclose the cable at least in a section of the means for collecting water on the land side into the body of water, with a cavity being formed between the cable and the means for cooling the cable that the water flows.

In the present case, the sheath-like enclosing of the cable is understood in particular to mean that the cable is arranged within a pipe. The cable lies freely in the pipe, for example. For example, the cable is not fixed inside the pipe.

In the event that the means for cooling the cable are a pipe or comprise a pipe, the water can be formed in one between the inner wall of the pipe and an outer surface (e.g. sheathing) of the cable Intermediate space from the body of water into the means for collecting water on the land side, and optionally flowing back into the body of water.

In this way, it is possible to counteract the general problems that arise when connecting, for example, an offshore wind farm to a transfer station installed on land (e.g. substation, to name just one non-limiting example), so that a sometimes at the transition from Thermal bottlenecks occurring from water to land can be effectively remedied. The cable can only be thermally stressed to a certain extent, which means that such thermal bottlenecks can occur. This applies in particular to the transition where the (e.g. sea) cable is transferred to land. The water of the body of water is used efficiently by means of the present system for temperature regulation at the transition from the body of water to the land. Furthermore, it is possible in this way, for example concrete, with which such a cable can be sheathed completely in order to reduce the thermal load on the cable in the transition from land to water.

• - Mittel zum Führen des Kabels, so dass das Kabel in den Mitteln zum Führen des Kabels geführt verlegt ist.

In an exemplary embodiment of the object according to all aspects, the system further comprises:

• - Means for guiding the cable, so that the cable is laid guided in the means for guiding the cable.

The means for guiding the cable guide the cable in a rigid, ie predetermined, manner. Alternatively, the means for guiding the cable guide it in a variable manner, in the latter case the means for guiding the cable are at least partially flexible.

In an exemplary embodiment of the object according to all aspects, the means for guiding the cable comprise a cable protection system, so that the cable is guided from a land-side exit point to the bottom of the body of water.

The cable protection system ensures in particular that mechanical stress on the cable in the area, e.g. B. a bend in the cable, does not lead to defects in the cable. Such an area in which the cable is bent is, for example, from an exit point of the cable into a body of water, the cable then being led to a bottom of the body of water.

For example, the cable is to be routed safely from the exit point from the land to the water (e.g. sea) on the ground (e.g. on the seabed) so that it can be deposited there. In order to control the mechanical stress on the cable, in particular, the cable in this area can also be provided with means for guiding the cable to the floor. The means for guiding the cable are, for example, a pipe bent at least partially in the transition area from an exit point from the land towards the ground. As an alternative or in addition, a type of scaffold can be used on which the cable can be placed and on which the cable can be guided to the floor in a controlled manner by means of holders for the cable arranged at different heights on the scaffold.

• - Erhöhung der Korrosionsbeständigkeit des Kabels;
• - Erhöhung der Temperaturbeständigkeit des Kabels;
• - Erhöhung der mechanischen Festigkeit des Kabels (z. B. schlagdämpfende Wirkung und/oder vor Abrieb durch äußere mechanische Einwirkung auf das Kabel schützend); und
• - Ermöglichen einer Vibrationsdämpfung des Kabels, um nur einige nicht-limitierende Beispiele zu nennen.

The cable protection system enables, for example, in addition to guiding the cable, e.g. B. in a controlled manner from an exit point of the cable in the water (z. B. sea) to the bottom of the water (z. B. seabed), further properties that aim in particular to increase the longevity of the cable . Such a cable protection system has one or more of the properties listed below with which the cable can be provided at least in a section on which the cable protection system is arranged:

• - Increasing the corrosion resistance of the cable;
• - Increasing the temperature resistance of the cable;
• - Increase in the mechanical strength of the cable (e.g. impact-absorbing effect and / or protecting the cable from abrasion due to external mechanical effects); and
• - Enabling vibration damping of the cable, to name just a few non-limiting examples.

In an exemplary embodiment of the object according to all aspects, the means for cooling the cable comprise a pipe, so that the cable is laid inside the pipe.

The export cables are usually pulled through a pipe. This pipe is inserted into the ground using a horizontal drilling process from the land side to the sea side.

The pipe is, for example, a so-called HDD (Horizontal Directional Drilling) pipe. The pipe is laid, for example, by means of a horizontal directional drilling process (also referred to as HDD), so that the cable can then be pulled into the laid pipe. For example, a pipe is drilled through the earth from the land to the water in such a way that the land-side end of the pipe is always below the water level of the body of water (e.g. sea level). This enables a further technical effect, according to which the risk of such a pipe silting up onto its water-side opening is reduced, so that water can pass through the sheath-like sheathing of the cable to regulate the temperature of the cable.

For example, at high tide or at high tide, the water flows through the pipe laid by means of the horizontal directional drilling method in the direction of the means for collecting water on the land side (e.g. a natural or artificially created water collection basin). At low tide or ebb tide, the water may flow back into the body of water (e.g. sea). The reflux amount can for example be regulated or controlled via the means for controlling the amount of water. This has a particularly cooling effect on the cable and thus its thermal load.

In an exemplary embodiment of the object according to all aspects, the pipe is double-walled, so that the water flows in a cavity formed between the double wall.

If the pipe, which encloses the cable at least in the area of the transition from the means for collecting water on the land side to the water, is double-walled at least in this area, the water does not come into direct contact with the water, as the water inside of the space formed in the double wall of the pipe flows. This can have a positive effect on the durability or longevity of the cable, but sometimes has a slightly reduced thermal effect, e.g. B. the cooling of the cable by the water. This is due to the fact that air chambers can occasionally form between the cable and the water, and air can only transfer the heat from the cable to the water in the manner of a heat exchanger to a small extent.

In an exemplary embodiment of the object according to all aspects, the land-side exit of the cable is below the lowest possible water level of the body of water.

This is particularly relevant if the body of water is the sea and the water level, i.e. sea level, falls and rises again due to the ebb and flow of the tide.

As a result, the water-side exit of the cable is also higher than the land-side exit, so that the risk of the pipe through which the cable is routed silting up is reduced or silting up is avoided.

In order to let the cable emerge from the earth under the water level, either a given natural topology of the environment is to be used or the means for collecting water on the land side are to be artificially introduced into the ground as one or more water collecting or collecting basins, for example so that the water can be collected in this or these.

• - eine Übergabestation (z. B. umfassend einen Trafo), die landseitig angeordnet ist, wobei das Kabel von den Mitteln zum landseitigen Sammeln von Wasser zu der Übergabestation geführt ist.

In an exemplary embodiment of the object according to all aspects, the system further comprises:

• - a transfer station (e.g. comprising a transformer) which is arranged on the shore, the cable being led from the means for collecting water on the shore to the transfer station.

The transfer station is, for example, a transformer station, by means of which the electrical energy generated by a wind energy installation connected to the cable or a wind farm connected to the cable can be transported to the consumer by means of a power distribution network. The generated electrical energy is converted, for example, from direct current to alternating or three-phase current. Furthermore, the generated electrical energy can be transformed to a voltage level used by the distribution network (e.g. 10/20 kV, or 400 V, to name just a few non-limiting examples).

In an exemplary embodiment of the object according to all aspects, the means for controlling an amount of water comprise a valve. Alternatively, a pump can be used to control the amount of water. In the latter case, the means for controlling a quantity of water accordingly comprise a pump, by means of which, in particular, water can be pumped back into the body of water from the means for collecting water on the land side.

Optionally, the system also includes such a valve and / or such a pump on the water side (e.g. sea / ocean side) of the cable.

The valve and / or the pump are therefore arranged (for example, installed) on the land side, for example. By means of the valve and / or the pump is z. B. a control of a reflux amount of water is possible. The same applies to an optional valve and / or a pump that can be arranged (e.g., installable) on the water side at the point where the cable enters the water from the land. In the event that a valve or a pump, or a combination of valve and pump, or both valve and pump are arranged both on the land side and on the water side, extremely precise control of the flow rate of water and thus temperature regulation of the cable in the Transition from the water to the land of the cable take place.

In an exemplary embodiment of the object according to all aspects, the means for controlling a quantity of water can be put into a maintenance mode, so that the cable can be removed from the means for cooling the cable.

The means for controlling an amount of water, e.g. B. comprising a valve and / or a pump, must be operable such. B. in the case of a valve can be opened, in the event of a fault in the cable (z. B. if the cable is defective), this from a sheath-like sheathing comprised by the means for cooling the cable (e.g. a (HDD) tube ) of the cable to be able to remove it (e.g. pull it out). Subsequently, a faultless, repaired or new cable can be inserted into the means for cooling the cable e.g. B. comprising a pipe can be retracted, or a corresponding cable can be pulled into the sheath-like sheathing.

As already disclosed above, it is objectively made possible that the cable does not have to be sheathed with concrete for its cooling. In the event of a fault, the cable is much easier to repair and maintenance of the cable, which is sometimes required, is also much easier, since concrete can be dispensed with and thermal efficiency is nevertheless guaranteed.

• - weitere Mittel zum Kühlen eines weiteren Kabels, welche ein weiteres Kabel zumindest in einem Abschnitt von den Mitteln zum landseitigen Sammeln von Wasser bis in das Gewässer hüllenartig umschließen, wobei zwischen dem weiteren Kabel und den Mitteln zum Kühlen des weiteren Kabels ein Hohlraum ausgebildet ist, durch den das Wasser strömt.

In an exemplary embodiment of the object according to all aspects, the system further comprises:

• - Further means for cooling a further cable, which enclose a further cable at least in a section of the means for collecting water on the land side into the body of water, a cavity being formed between the further cable and the means for cooling the further cable, through which the water flows.

Corresponding several cables can end in the means for collecting water on the land side, so that several cables can be temperature-regulated, in particular in their respective transition from land to water. In the case of several (i.e. at least two) cables inserted into them, the means for collecting water on the shore include a larger capacity, so that the amount of water is sufficient to cool the cables. Correspondingly, the system can in particular comprise several (i.e. at least two) means for regulating the temperature (e.g. cooling) of cables.

The further means for cooling a further cable can be designed in a manner analogous to the means for cooling the cable and / or comprise or have the same features.

In an exemplary embodiment of the object according to all aspects, the cable and / or the further cable each transport electrical energy generated by a wind energy installation or a wind park comprising several (i.e. at least two) wind energy installations.

In an exemplary embodiment of the object according to all aspects, the means include a natural water reservoir or an artificially constructed water reservoir for the onshore collection of water.

As already disclosed above, the means for collecting water on the land side are or comprise, for example, a collecting basin for water. This must be dimensioned according to the number of temperature-regulating (e.g. cooling) cables. In the event that, for example, six cables are to be cooled, a corresponding collecting basin must be relatively large, since the cables, for example, each run in a pipe from a wind turbine or wind farm on land connected to the cable into the means for collecting water on the land side will. For example, the means for collecting water on the shore side must have at least the capacity of the volumes of the means terminating in these means for temperature regulating a cable (e.g. its sheath-like sheaths) in order to safely transport all cables located therein e.g. B. to be able to cool.

In an exemplary embodiment of the object according to all aspects, the sea represents the body of water, and during high tide water flows from the sea through the means for cooling the cable into the means for collecting water on the shore and, at low tide, the water from these back into the sea.

The flow or current of water can also flow from the body of water (e.g. sea) through the means for cooling the cable into the means for collecting water on the land side at high water and back into the body of water at low water. By means of a pump and / or a valve, the amount of flowing or flowing water can be controlled and / or regulated, i.e. increased or decreased.

The exemplary embodiments of the present invention described above in this description should also be understood to be disclosed in all combinations with one another. In particular, exemplary configurations should be understood in relation to the different aspects disclosed.

In particular, the previous or following description of method steps in accordance with preferred embodiments of a method should also disclose corresponding means for carrying out the method steps by preferred embodiments of a device. Likewise, the disclosure of means of a device for performing a method step is also intended to reveal the corresponding method step.

Further advantageous exemplary embodiments of the invention can be found in the following detailed description of some exemplary embodiments of the present invention, in particular in connection with the figures. However, the figures are intended only for the purpose of clarification, but not for determining the scope of protection of the invention. The figures are not true to scale and are only intended to reflect the general concept of the present invention by way of example. In particular, features contained in the figures should by no means be regarded as a necessary part of the present invention.

Figure list

• 1 eine schematische Darstellung eines gegenständlichen Systems.

In the drawing shows

• 1 a schematic representation of an objective system.

Detailed description of some exemplary embodiments

1 shows a schematic representation of an objective system.

The system 100 is at least partially in transition for temperature regulation U cable laid from land to water (here the sea) 110 trained and / or set up. The system 100 includes funds 130 for onshore collection of water, so that water 150 in these funds 130 collected and from these funds 130 can be output. The system 100 also includes funds 120 to control a lot of water, making a lot of water 150 that from the funds 130 for the onshore collection of water flows out or flows into this, is controllable. The system also includes 100 middle 140 for cooling a cable, in particular for cooling the cable 110 which the cable 110 at least in a section of the funds 130 for the onshore collection of water up to the sea. Between the cable 110 and the means 140 a cavity is formed to cool the cable through which the water 150 flows. The system also includes a transfer station 160 with one end of the cable 110 connected is. Not shown in 1 that the other end of the cable 110 is connected to an offshore wind turbine or an offshore wind park, so that by means of the cable 110 Electrical energy generated by the offshore wind energy installation or the offshore wind park can be transported to the transfer station (e.g. comprising a transformer).

In the present case it concerns the means 130 for the onshore collection of water around a natural collecting basin for water 150 , the at least that amount of water is suitable 150 to collect that is needed to make the cable 110 in transition U from land, here the dune 170 to be able to cool to the sea.

The means 140 for cooling a cable, in this case cable 110 , include a pipe that is laid from land into the sea using the HDD process, i.e. horizontal directional drilling process. The sea-side exit of the cable 110 is not directly on the sea floor MB, so that there is still a difference in altitude H needs to be bridged to the cable 110 in a controlled manner on the seabed MB, from where it extends to an offshore wind turbine or an offshore wind park.

It can be seen that the cable emerges from the sea 110 higher than the exit of the cable 110 within the natural collection basin 130 . Would the bore of the pipe 180 rise from the sea side to the land side, the pipe could at some point be free of water, so that sufficient cooling of the cable 110 in transition U can no longer be guaranteed.

At the exit point of the pipe 180 in the means 130 A valve is also used as a means for collecting water on the land side 120 to control a lot of water 150 arranged to the amount of water 150 those used to cool the cable 110 through the pipe 180 flows, to control and / or regulate. The sea-side exit of the cable 110 is also below the lowest possible water level 200 (here: the sea level), so that it can be guaranteed that always sea water at least from the sea into the natural catchment basin 130 can flow or flow.

Instead of concrete (or some type of concrete) with which the pipe 180 would also be fillable, it is intended to represent the water 150 through the pipe 180 to let flow. Concrete or various types of concrete have better thermal conductivity than air, but it is disadvantageous, especially in the case of maintenance or repair, and the thermal conductivity of water is also better than that of air. When the pipe 180 is filled with concrete, the cable can 110 not easily out of the pipe 180 be removed again. Often a new pipe has to e.g. B. laid in the HDD process and a new cable 110 be pulled into the newly laid pipe.

Will be in the tube 180 Leaving air would be the thermal load on the cable 110 in transition U significantly increased, since air acts more as an insulator than z. B. Concrete.

Exemplary configurations according to all aspects make it possible that the exit point of the bore or, in its consequence, the pipe 180 on the land side, i.e. within the means for collecting water on the land side 130 is below sea level. Furthermore, the cable 110 for example, emerge under the sea surface in a controlled manner or at least below the maximum possible sea level.

Instead of the natural collecting basin 130 A concrete basin can also be built extra so that the water 150 through the pipe 180 can flow into this and back out again. The operating principle is identical here.

The water 150 can through the pipe 180 to cool the cable 110 for example, either only through the tides, i.e. ebb and flow through the pipe 180 flow or stream. Alternatively or in addition, the water can 150 on the land side, e.g. B. within the means for collecting water on the land side 130 regulated by means of a valve and / or a pump through the pipe 180 flow or stream. In the latter case, the water can 150 z. B. purposefully drain in certain situations, z. B. when an increased cooling of the cable by an increased amount of electrical energy to be transported by means of the cable 110 is necessary, to give just one non-limiting example.

The exemplary embodiments of the present invention described in this specification and the respective optional features and properties cited in this regard should also be understood to be disclosed in all combinations with one another. In particular, the description of a feature encompassed by an exemplary embodiment - unless explicitly stated to the contrary - should not be understood in the present case in such a way that the feature is essential or essential for the function of the exemplary embodiment. The sequence of the method steps described in this specification in the individual flowcharts is not mandatory; alternative sequences of the method steps are conceivable. The method steps can be implemented in various ways, so implementation in software (by means of program instructions), hardware or a combination of both is conceivable for implementing the method steps.

Terms such as “comprise”, “have”, “include”, “contain” and the like used in the patent claims do not exclude further elements or steps. The phrase “at least partially” includes both the case “partially” and the case “completely”. The phrase “and / or” should be understood to the effect that both the alternative and the combination should be disclosed, ie “A and / or B” means “(A) or (B) or (A and B)”. The use of the indefinite article does not exclude a plurality. A single device can perform the functions of several units or devices mentioned in the patent claims. Reference symbols given in the claims are not to be regarded as restrictions on the means and steps used.

List of reference symbols

100

system

110

cable

120

Means for controlling a quantity of water

130

Means for collecting water on land

140

Means for cooling a cable

150

water

160

Transfer station

170

Land (e.g. beach, dune, or the like)

180

HDD tube

190

Cable protection system

200

maximum water level

U

Land / water transition

H

Difference in height for guiding the cable to the bottom of the body of water

M.

Bottom of the body of water

Claims (14)

System (100) for temperature regulation of a cable (110) laid at least partially in the transition (U) from land to water, comprising: - Means for collecting water (130) on the land side, so that water (150) can be collected in these means (130) and can be output from these means (130); - Means for controlling an amount of water (120), so that an amount of water (150) which flows out of the means for collecting water (130) on the shore side or flows into them from the body of water can be controlled; and - Means for cooling a cable (140) which enclose the cable (110) at least in a section from the means for collecting water (130) on the land side into a body of water, wherein between the cable (110) and the means for Cooling of the cable (140) a cavity is formed through which the water (150) for cooling the cable (140) flows. System (100) according to Claim 1 , further comprising: means for guiding the cable, so that the cable (110) is laid in a guided manner in the means for guiding the cable (110). System (100) according to Claim 2 wherein the means for guiding the cable comprise a cable protection system (190), so that the cable (110) is guided from a land-side exit point to a bottom (M) of the body of water. The system (100) according to any one of the preceding claims, wherein the means for guiding the cable comprises a pipe (180) so that the cable (110) is laid within the pipe (180). System (100) according to Claim 4 , wherein the pipe (180) is double-walled, so that the water (150) flows in a cavity formed between the double wall. System (100) according to one of the preceding claims, wherein the land-side exit of the cable is below the lowest possible water level (200) of the body of water. The system (100) according to any one of the preceding claims, further comprising: - A transfer station (160) which is arranged on the land side, the cable (110) being led from the means for collecting water (130) on the land side to the transfer station (160). The system (100) of any preceding claim, wherein the means for controlling an amount of water (120) comprises a valve. System (100) according to one of the preceding claims, wherein the means for controlling an amount of water (120) can be placed in a maintenance mode so that the cable (110) can be removed from the means for guiding the cable. The system (100) according to any one of the preceding claims, further comprising: - Further means for cooling a further cable, which enclose a further cable at least in a section from the means for collecting water (130) on the land side into the body of water, with a cavity between the further cable and the means for cooling the further cable is formed through which the water (150) flows. System (100) according to one of the preceding claims, wherein the cable (110) and / or the further cable each transport electrical energy generated by a wind energy installation or a wind park comprising a plurality of wind energy installations. System (100) according to one of the preceding claims, wherein the means for collecting water (130) on the land side comprise a natural water reservoir, or comprise an artificially constructed water reservoir. A system (100) according to any one of the preceding claims, wherein the sea represents the body of water, and during high tide water from the sea through the means for cooling the cable (140) into the means for collecting water on land (130) and at low tide the water (150) from these flows back into the sea. Use of a system (100) according to one of the Claims 1 until 13th for connecting at least one offshore wind turbine.

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